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Exhibit： View the Exhibit to see the data in the emp table.  You created a PRIMARY KEY constraint on the empno column of the emp table， and the constraint is not deferred. Which two statements are true in this scenario？ （）
A:No index would be created or used in this case.
B:A unique index on the empno column would be created.
C:A CHECK constraint would be enforced on the empno column.
D:A NOT NULL constraint would be enforced on the empno column.
E:A bitmap unique index would be created on the empno column.

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出自：Oracle认证

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